Alarm triggering system for banks - has photoelectric device in base of note tray automatically activating alarm when exposed to light

摘要

The alarm triggering system is used in a bank burglar alarm. The bank's money, especially notes are held in trays. The tray has at its bottom (1) a photoelectronic device (5) which responds to incident vertical light. The photoelectronic device is connected to an alarm system (9). All trays can have these devices which are optionally connected separately or in groups to alarm system. The light sensitive device is embedded in tray bottom and it is level with tray bottom surface. The photoelectronic device can be a photocell, photoresistor, photodiode or a photo-transistor, which operates the alarm automatically on removal of the notes.